Chemical element, symbol Mc and atomic number 115 / From Wikipedia, the free encyclopedia

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Moscovium is a synthetic chemical element; it has symbol Mc and atomic number 115. It was first synthesized in 2003 by a joint team of Russian and American scientists at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. In December 2015, it was recognized as one of four new elements by the Joint Working Party of international scientific bodies IUPAC and IUPAP. On 28 November 2016, it was officially named after the Moscow Oblast, in which the JINR is situated.[8][9][10]

Quick facts: Moscovium, Pronunciation, Mass number, Moscov...
Moscovium, 115Mc
Pronunciation/mɒˈskviəm/ (mos-SKOH-vee-əm)
Mass number[290]
Moscovium in the periodic table


Atomic number (Z)115
Groupgroup 15 (pnictogens)
Periodperiod 7
Block  p-block
Electron configuration[Rn] 5f14 6d10 7s2 7p3 (predicted)[1]
Electrons per shell2, 8, 18, 32, 32, 18, 5 (predicted)
Physical properties
Phase at STPsolid (predicted)[1]
Melting point670 K (400 °C, 750 °F) (predicted)[1][2]
Boiling point~1400 K (~1100 °C, ~2000 °F) (predicted)[1]
Density (near r.t.)13.5 g/cm3 (predicted)[2]
Heat of fusion5.90–5.98 kJ/mol (extrapolated)[3]
Heat of vaporization138 kJ/mol (predicted)[2]
Atomic properties
Oxidation states(+1), (+3) (predicted)[1][2]
Ionization energies
  • 1st: 538.3 kJ/mol (predicted)[4]
  • 2nd: 1760 kJ/mol (predicted)[2]
  • 3rd: 2650 kJ/mol (predicted)[2]
  • (more)
Atomic radiusempirical: 187 pm (predicted)[1][2]
Covalent radius156–158 pm (extrapolated)[3]
Other properties
Natural occurrencesynthetic
CAS Number54085-64-2
NamingAfter Moscow region
DiscoveryJoint Institute for Nuclear Research and Lawrence Livermore National Laboratory (2003)
Isotopes of moscovium
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
286Mc synth 20 ms[5] α 282Nh
287Mc synth 38 ms α 283Nh
288Mc synth 193 ms α 284Nh
289Mc synth 250 ms[6][7] α 285Nh
290Mc synth 650 ms[6][7] α 286Nh
Symbol_category_class.svg Category: Moscovium
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Moscovium is an extremely radioactive element: its most stable known isotope, moscovium-290, has a half-life of only 0.65 seconds.[7] In the periodic table, it is a p-block transactinide element. It is a member of the 7th period and is placed in group 15 as the heaviest pnictogen, although it has not been confirmed to behave as a heavier homologue of the pnictogen bismuth. Moscovium is calculated to have some properties similar to its lighter homologues, nitrogen, phosphorus, arsenic, antimony, and bismuth, and to be a post-transition metal, although it should also show several major differences from them. In particular, moscovium should also have significant similarities to thallium, as both have one rather loosely bound electron outside a quasi-closed shell. Over a hundred atoms of moscovium have been observed to date, all of which have been shown to have mass numbers from 286 to 290.

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